Basic characteristics of gray iron castings
Release time:
2024-03-12 10:05
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The basic characteristics of high density molding sand for gray iron castings are: the addition of pulverized coal is also low. Therefore, in the sand should grasp the following points.
① Clay content and silt content. High clay content of sand, with the specific pressure rise strength also increased, usually effective bentonite control in 7% to 10%. The sum of effective clay and dead clay in the molding sand is equivalent to the silt content, which is generally controlled at 12% ~ 16%. The mud content is too high or too low will affect the performance indicators of the sand.
② Moisture. Moisture is the main factor that determines the plasticity and bonding force of clay in the manufacturing sand of lost vanishing mold castings. When the moisture is too high, it is easy to cause the clay bonding force to deteriorate, the fluidity of the sand decreases, and the uniform mold density is not obtained. When the moisture is too low, the sand is not easy to mix, the sand strength is low, the brittleness is large, the mold is poor, and it is easy to cause the casting to have sand sticking defects. Generally, the moisture should be controlled at 10% ~ 20% higher than the moisture when the wet compressive strength peak is obtained.
③ Grain size of raw sand. High density molding when the sand density is high, pouring expansion, so the original sand particle size should not be too concentrated, the original sand particles are round or polygonal, generally choose three-screen sand or four-screen sand.
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Basic characteristics of gray iron castings
Clay content and silt content. High clay content of sand, with the specific pressure rise strength also increased, usually effective bentonite control in 7% to 10%. The sum of effective clay and dead clay in the molding sand is equivalent to the silt content, which is generally controlled at 12% ~ 16%. The mud content is too high or too low will affect the performance indicators of the sand.
Now it has 2 excellent automatic casting production lines of Denmark Disha, with an annual production capacity of 50000 tons of various castings. The company's construction fasteners,
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